Interesting! So if anyone should want to make their custom level public I guess this thread would be the obvious choice... Looking forward to it :)
Some custom users maps has been published on the discussion about FPV Freerider at RCGroups .
You can find them here (look at the latest pages from page 251 and on):
https://www.rcgroups.com/forums/showthread.php?2394419-FPV-Freerider-Quadcopter-...